<template>
  <div>
    
    <ul>
      <li
        v-for="(item, index) in arr"
        :key="index">{{ item }}
      </li>
    </ul>
    <button @click="app">走一走</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      arr:['帅哥','美女','程序猿']
    };
  },
  methods: {
    app() {
      this.arr.push(this.arr.shift())
    // this.arr.push(this.arr[0])
    // this.arr.shift(this.arr[0])
    },
  },
};
</script>

<style>
</style>
